at 1000 land, the cost is increased by 8%
at 2000 land, the cost is increased by 20%
at 3000 land, the cost is increased by 27%
at 5000 land, the cost is increased by 36%
at 7000 land, the cost is increased by 43%

etc….

Villager Cost for Exploration

(Roughly, > 1000 acres) Villager Cost per Acreb = ((acres1.2)/254)+5

bResults may be off by +/- 1 villager (and +/- 2 villagers at over 10,000 acres)